What is this pill - with 'zz' 100 imprint?

I was provided a generic Spironolactone that has a 100 on one side (for 100mg) and either a Z/Z or an N/N on the other. I don't know if the lettering is an N or a Z because the pill half line is exactly between the two letters, in a straight line. So if you hold it one way, it's a Z, and if you turn it, it's an N. The pills smell like the previous brand of Spiro I had, but don't seem as effective.